An actively controlled fluid damper utilising a magnetorheological fluid

摘要

A damper system comprising: a damper having a cylinder 50 defining a chamber 52; a magnetorheological fluid located in the chamber; a piston 56 moveable within the chamber against resistance of the fluid; and an electromagnet 64 capable of applying a magnetic field across the fluid to alter the viscosity of the fluid and thereby the response of the damper. Position 80 and load 81 sensors, respectively produce analogue position 82 and load 83 output signals. The load output signal is converted to a digital signal by A-D converter 108, and the position output signal is differentiated by analogue differentiation unit 109 into an analogue signal representative of the velocity of the piston and cylinder and is then converted into a digital signal by A-D converter 110. These digital signals are then processed by the digital micro-controller 111 which generates a digital control signal 105 which is then converted to an analogue signal by D-A converter 107 to produce analogue control signal 106 which controls the response of the damper.